I see Northants police want to search shopping trolleys to make sure that people aren't picking up inessential things in their shopping.
We will not, at this stage, start [...] checking the items in baskets and trolleys to see whether it’s a legitimate, necessary item.
But again, be under no illusion, if people do not heed the warnings and the pleas I’m making today, we will start to do that. link
Just in case you're unclear on what he meant by "checking items to see whether it's a legitimate necessary item" Chief Constable Nick Adderley clarified things on Twitter
I have been clear that we will not be judge and jury on what is an essential item or not link
Ah right, that's perfectly clear. Crystal.